5.3 DNA and genes

5.3 DNA and genes
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5.3 DNA and genes

Slide 1 - Diapositive

DNA

Slide 2 - Diapositive

DO YOU REMEMBER?

Slide 3 - Diapositive

nucleotides (base of DNA)

Slide 4 - Diapositive

4 different bases (nucleotides)
cytosine
guanine
adenine
thymine

Slide 5 - Diapositive

Slide 6 - Diapositive

double helix (ladder)

Slide 7 - Diapositive

information is stored in code
AATCCGGACGAATTCCGGAAAAAATTTTTTTTTTTTTTTTTTCGCGCGAATTCATATATATCGGACGGACGAAC etc etc etc it would be a very thick book :-)

Slide 8 - Diapositive

GENE: section of DNA with complete code for a protein

Slide 9 - Diapositive

proteins
Lots of functions
E.g. enzymes, hormones, antibodies, cell structure

gene = code for 1 protein

Genes determine your characteristics

Slide 10 - Diapositive

copying
you start with one fertilised egg with 46 chromosomes...
you end up with billions of cells with the same 46 chromosomes => all of them a copy from the original.....
things can go wrong on the way => mutations (5.5)

Slide 11 - Diapositive

from DNA code to proteins
3 bases = 1 amino acid
ACC is code for one type
AAG is code for another

21 different amino acids.
string of amino acids = protein

Slide 12 - Diapositive

amino acids -> protein

Slide 13 - Diapositive

The molecule
shown in the
picture is called ...
A
DNA
B
single stranded DNA
C
an amino acid
D
a ribosome

Slide 14 - Quiz

This is a picture of ..
A
chromosome
B
gene
C
DNA
D
cell

Slide 15 - Quiz

Below are a few codes with 4 letters.
Which of these codes show a piece ofDNA?
A
ABCDBDCA
B
CAEFEAFC
C
GACTATGC
D
TACDDTAC

Slide 16 - Quiz

What do you call the part of a chromosome that carries the information for 1 heriditary trait?



A
DNA
B
a gene
C
a mother cell
D
an egg cell

Slide 17 - Quiz

Does the information for hereditary traits change when a cell is copied?

A
yes
B
no

Slide 18 - Quiz

this is a picture of ........
A
cell
B
chromosome
C
DNA
D
gene

Slide 19 - Quiz

Practice
Read paragraph 5.3
make 5.3 exercises 9-14

Slide 20 - Diapositive